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* [[Cyclone Hamoon|Hamoon]]
* [[Cyclone Hamoon|Hamoon]]
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* {{tcname active|Midhili}}
* [[Cyclone Midhili|Midhili]] '''''(active)'''''
* {{tcname unused|Michaung}}
* {{tcname unused|Michaung}}
* {{tcname unused|Remal}}
* {{tcname unused|Remal}}

Revision as of 13:28, 17 November 2023

2023 North Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed30 January 2023
Last system dissipatedSeason ongoing
Strongest storm
NameMocha
 • Maximum winds215 km/h (130 mph)
(3-minute sustained)
 • Lowest pressure938 hPa (mbar)
Seasonal statistics
Depressions8, 1 unofficial
Deep depressions5, 1 unofficial
Cyclonic storms5, 1 unofficial
Severe cyclonic storms4
Very severe cyclonic storms4
Extremely severe cyclonic storms3 (record high, tied with 1999 and 2019)
Super cyclonic storms0
Total fatalities487 total
Total damage$1.6 billion (2023 USD)
Related articles
North Indian Ocean tropical cyclone seasons
2021, 2022, 2023, 2024, 2025

The 2023 North Indian Ocean cyclone season is an ongoing event in the annual cycle of tropical cyclone formation.[1] The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the peak from May to November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. However, a cyclone can form at any time during the year shown by an unnamed depression that affected Sri Lanka in January-February.

The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula. There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated ARB by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated BOB by the IMD.

The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories for interest. On average, three to four cyclonic storms form in this basin every season.[2]

Season summary

Cyclone MidhiliCyclone HamoonCyclone TejCyclone BiparjoyCyclone Mocha
Extremely Severe Cyclonic Storm Mocha and a disturbance below the equator which would later become Fabien on May 13.

Nearing the end of January, a tropical depression classified as BOB 01 formed, becoming the first storm in the basin. The storm's formation makes it the first time since 2019 to see a storm develop in the month of January in the basin. BOB 01 was short-lived and dissipated after making landfall on Sri Lanka.

After almost four months of inactivity, the IMD began to monitor a disturbance which was located in the Bay of Bengal on May 6. The system steadily improved and was upgraded into a Depression by the IMD with it being classified as BOB 02. Soon afterwards on May 10, it intensified to a Deep Depression. On the next day, it strengthened into a Cyclonic Storm with the IMD naming the system Mocha. Mocha afterwards, began to rapidly intensify and reached its peak intensity as a Category 5-equivalent cyclone on May 14. Mocha then made landfall just north of Sittwe, Myanmar as a Category 4-equivalent cyclone. The cyclone then rapidly weakened and was last noted over the Chinese province of Yunnan on May 15. Mocha caused heavy damage across Myanmar and Bangladesh and killed at least 400 people. On June 6, a Depression formed in the Arabian Sea, which was later named Biparjoy and rapidly intensified to a Category 1-equivalent cyclone. On June 9, Tropical Storm 03B was designated by the JTWC in the Bay of Bengal.[3] On July 31, a low-pressure area developed into Tropical Storm 04B, which was designated by the JTWC. On September 30, ARB 02 formed.

The season has also produced the second-most accumulated cyclone energy in this basin on record, only behind 2019. [citation needed]

Systems

Depression BOB 01

Depression (IMD)
 
Duration30 January – 2 February
Peak intensity45 km/h (30 mph) (3-min);
1004 hPa (mbar)

On 25 January, a cyclonic circulation formed over the equatorial Indian Ocean and the adjoining Bay of Bengal.[4] Under an influence of cyclonic circulation, a low-pressure area formed on 27 January.[5] Substantially, it concentrated into a well-marked low-pressure area on 29 January.[6] During the next day, the well-marked low organized to depression.[7] The JTWC later issued a Tropical Cyclone Formation Alert (TCFA) for the system.[8] However, increasing land interaction with Sri Lanka prompted the JTWC to downgrade the system's chance for development to medium and subsequently canceling its TCFA.[9] The disturbance finally weakened into a well-marked low pressure over Gulf of Mannar on 2 February.[10]

Extremely Severe Cyclonic Storm Mocha

Extremely severe cyclonic storm (IMD)
Category 5 tropical cyclone (SSHWS)
 
Duration9 May – 15 May
Peak intensity215 km/h (130 mph) (3-min);
938 hPa (mbar)
Main article: Cyclone Mocha

A circulation formed on 6 May over the Bay of Bengal as a result of the amplitude of the Madden–Julian oscillation (MJO), according to the IMD.[11] The JTWC also began monitoring the system on 7 May, marking its flaring convection to the west of the circulation.[12] On 9 May, the system was upgraded to a depression.[13] The JTWC later issued a TCFA on the system as it was situated in very warm sea surface temperatures.[14] The storm subsequently intensified into a deep depression at 03:00 UTC of 9 May,[15] before upgrading further to a cyclonic storm on 11 May, attaining the name Mocha.[16] The JTWC followed suit in upgrading the system to tropical cyclone status the same day.[17] Mocha quickly intensified to a severe cyclonic storm at 12:00 UTC after reaching winds of 105 km/h (65 mph).[18] After forming an eye,[19] Mocha became a very severe cyclonic storm on 12 May.[20] Mocha rapidly intensified to an extremely severe cyclonic storm at 18:00 UTC,[21] before undergoing an eyewall replacement cycle.[22] After having completing the cycle on 13 May, Mocha rapidly intensified and reached a peak intensity as a Category 5-equivalent tropical cyclone the next day,[23] shortly before the storm entered unfavourable conditions.[24] Mocha weakened before making landfall near Sittwe, Myanmar.[25] Mocha began to weaken swiftly after landfall due to Myanmar's terrain, with wind shear degrading the storm further.[26] The system downgraded to a depression on 15 May,[27] shortly before becoming marked as a low-pressure area.[28]

The death toll from Cyclone Mocha varies significantly. ASEAN reported a total of 145 deaths,[29] whereas the National Unity Government of Myanmar (NUG) stated that Mocha killed at least 463 people, including three indirect deaths in Bangladesh. The cyclone also injured 719 people and left 101 others missing.[30] It caused about US$1.5 billion of damage in Myanmar.[31]

Extremely Severe Cyclonic Storm Biparjoy

Extremely severe cyclonic storm (IMD)
Category 3 tropical cyclone (SSHWS)
 
Duration6 June – 19 June
Peak intensity165 km/h (105 mph) (3-min);
958 hPa (mbar)
Main article: Cyclone Biparjoy

A cyclonic circulation formed over the Arabian Sea on 5 June.[32] On the same day, a low-pressure area formed as a result of cyclonic circulation.[33] The following day, it intensified significantly into a depression.[34] The IMD upgraded the depression to a deep depression, and subsequently to Cyclonic Storm Biparjoy.[35][36] The JTWC subsequently classified it as Tropical Cyclone 02A. [37] By 00:00 UTC on 7 June, the IMD upgraded the system to a severe cyclonic storm with winds of 100 km/h (65 mph).[38] At the cloud tops Biparjoy warmed and the convective burst collapsed, resulting in an upper-level outflow from the storm and pushing it back towards its system core.[39] Biparjoy was upgraded to a very severe cyclonic storm at 06:00 UTC, at which point the system became a Category 2-equivalent tropical cyclone.[40][41] The cyclone suffered wind shear due to moderate easterly vertical wind, with the deep convection displaced from the LLCC.[42] Biparjoy unexpectedly rapidly intensified and became a Category 3-equivalent cyclone on 11 June.[43][44] Biparjoy reached its peak intensity as an extremely severe cyclonic storm, with maximum 3-minute sustained winds of 165 km/h (105 mph).[45] The shear decreased and convective organization and areal extent increased.[46] Biparjoy gradually weaken with convective banding over the northern semicircle.[47] Biparjoy made landfall on 16 June near Naliya, India, with sustained winds of 95 km/h (60 mph).[48][49] Shortly after its landfall, the JTWC discontinued warnings on the system.[48] and was later marked as a low-pressure area by the IMD on 19 June, prompting the discontinuation of advisories on the system.[50]

In Pakistan, 81,000 people were evacuated from the southeastern coast, and authorities established 75 relief camps at schools to provide assistance.[51] At least 23 people were injured as well as 4,600 villages were affected by power outages in India.[52] A total of 12 people were confirmed to have been killed by the storm.[53][54][55]

Deep Depression BOB 03

Deep depression (IMD)
Tropical storm (SSHWS)
 
Duration31 July – 3 August
Peak intensity55 km/h (35 mph) (3-min);
988 hPa (mbar)

On 29 July the IMD noted a cyclonic circulation forming over North Odisha and nearby Gangetic West Bengal. On the same day, it noted the formation of low pressure area over same region and on next day it moved over the Northeastern part of Bay of Bengal.[56] By the same time at 06:00 UTC on 31 July, the JTWC designated it as Invest 95B and gave low chance of developing.[citation needed] Despite its low level circulation exposed, it continued to intensify and at 12:00 UTC of the same day, the IMD upgraded it to a well marked low.[56] On 21:00 UTC, the JTWC upgraded it to a tropical storm designated as 04B and peaked as a 40 kt storm.[citation needed] On 00:00 UTC of 1 August, the IMD upgraded it to a Depression designated as BOB 03. It continued to intensify till Deep Depression intensity off the coast of Bangladesh and made landfall at Khepupara in Bangladesh at 12:00 UTC.[56] The JTWC stopped issuing advisories by 06:00 UTC stating that it made landfall.[citation needed] It continued to move into Eastern India while maintaining intensity. It weakened into Depression over Jharkhand on 2 August 18:00 UTC. Continued to move west-northwest, it became a well-marked low pressure area over north Chhattisgarh and nearby region by 12:00 UTC on 3 August.[56]

Depression ARB 02

Depression (IMD)
 
Duration30 September – 1 October
Peak intensity45 km/h (30 mph) (3-min);
1002 hPa (mbar)

IMD marked a low pressure area off the Konkan coast and rapidly upgraded into a depression designated as ARB 02 on 30 September.[57] ARB 02 made landfall with the same speed and caused heavy rainfall that day. It moved overland and later gradually weakened into a well marked low pressure area by the IMD on 1 October.

Extremely Severe Cyclonic Storm Tej

Extremely severe cyclonic storm (IMD)
Category 3 tropical cyclone (SSHWS)
 
Duration20 October – 24 October
Peak intensity175 km/h (110 mph) (3-min);
959 hPa (mbar)
Main article: Cyclone Tej

On 16 October 2023, the India Meteorological Department (IMD) began monitoring the potential for a formation of a cyclonic circulation in the Arabian Sea.[58] In Arabian Sea, the relatively higher sea surface temperature, pointing to positive Indian Ocean Dipole, created the favourable condition for the formation of cyclogenesis.[59] A cyclonic circulation formed over the Arabian Sea on 16 October.[58] A low-pressure area formed as a result of the cyclonic circulation on morning of 18 October. It intensified into Depression on 21 October. At the same day, the system intensified into Cyclonic Storm, received the name Tej. As it moves northwestward, Tej was in warm waters of Arabian Sea, rapidly intensified into a Category-3 tropical cyclone on October 22. The storm later weakened and made landfall over Al Mahrah Governorate of Yemen between 23 and 24 October 2023, bringing significant rainfall and flooding across the eastern half of the country and western parts of Oman.[60]

Torrential rain on Saturday caused flooding on the island of Socotra as the cyclone made landfall.[61] The flooding led to some roads in the governorate's capital city of Hadibu being cut, along with other areas in the archipelago. The Socotra Airport recorded 13 mm (0.51 in) of rain, with wind speeds reaching 25 kn (45 km/h; 30 mph) and gusts exceeding 25 kn (45 km/h; 30 mph).[62]

Very Severe Cyclonic Storm Hamoon

Very severe cyclonic storm (IMD)
Category 2 tropical cyclone (SSHWS)
 
Duration21 October – 25 October
Peak intensity120 km/h (75 mph) (3-min);
985 hPa (mbar)
Main article: Cyclone Hamoon

On October 21, Tropical Depression 06B formed in the Bay of Bengal. It was upgraded to a Cyclonic Storm on October 23, receiving the name Hamoon. On October 24, Hamoon intensified into a category 2-equivalent cyclone, reaching its peak intensity on October 24, with sustained winds of 120km/h (75 mph) and gusts of 140 km/h (85 mph).[63]

As the system lashed the country, five people were killed in total as Hamoon crossed the Cox's Bazar and Chittagong coasts. Hundreds were left homeless as their homes were severely damaged, while trees were uprooted, and electric poles are down.[64]

In India, several districts of Tamil Nadu are expected to experience heavy rainfall for the next two days as cyclonic storm Hamoon is anticipated to further intensify. A yellow warning has been issued for six districts in the state.[65]

Cyclonic Storm Midhili

Cyclonic storm (IMD)
Tropical storm (SSHWS)
 
Duration14 November – Present
Peak intensity75 km/h (45 mph) (3-min);
1000 hPa (mbar)
Main article: Cyclone Midhili

Cyclone Midhili is a tropical cyclone which currently threatening. On 14 November, a Depression formed and it gradually intensity into a Cyclonic Strom.

Other system

A tropical cyclone off the coast of Bangladesh in June 9
  • Under the influence of another cyclonic circulation, a low-pressure area formed over the northeast Bay of Bengal on 9 June,[66] which later concentrated into a well-marked low-pressure area on the same day.[67] The JTWC reported that the system had become a Tropical Cyclone 03B after its low-level circulation center became fully exposed within disorganized convection on the western semicircle of the storm.[3][68] The system weakened back into a low-pressure area over Bangladesh and IMD issued the last advisory.[69] The JTWC also discontinued warnings on the system around 03:00 UTC on 10 June.[70]

Storm names

Within this basin, a tropical cyclone is assigned a name when it is judged to have reached cyclonic storm intensity with winds of 65 kilometres per hour (40 mph). The names were selected by a new list from the Regional Specialized Meteorological Center in New Delhi by mid year of 2020.[71] There is no retirement of tropical cyclone names in this basin as the list of names is only scheduled to be used once before a new list of names is drawn up. Should a named tropical cyclone move into the basin from the Western Pacific, then it will retain its original name. The next eight available names from the List of North Indian Ocean storm names are below.[72]

  • Midhili (active)
  • Michaung (unused)
  • Remal (unused)
  • Asna (unused)

Season effects

This is a table of all storms in the 2023 North Indian Ocean cyclone season. It mentions all of the season's storms and their names, duration, peak intensities according to the IMD storm scale, damage, and death totals. Damage and death totals include the damage and deaths caused when that storm was a precursor wave or extratropical low. All of the damage figures are in 2023 USD.

Name Dates Peak intensity Areas affected Damage
(USD) 		Deaths Refs
Category Wind speed Pressure
BOB 01 30 January – 2 February Depression 45 km/h (30 mph) 1004 hPa (29.65 inHg) Sri Lanka None 0
Mocha 9–15 May Extremely severe cyclonic storm 215 km/h (130 mph) 938 hPa (27.70 inHg) Andaman and Nicobar Islands, Sri Lanka, Myanmar, Bangladesh, India, China $1.5 billion 463 [73][25]
Biparjoy 6–19 June Extremely severe cyclonic storm 165 km/h (105 mph) 958 hPa (28.29 inHg) India, Pakistan $124 million 17
03B 9–10 June Tropical storm 75 km/h (45 mph)[nb 1] 991 hPa (29.26 inHg) [nb 2] Myanmar, Bangladesh None 0
BOB 03 31 July – 3 August Deep depression 55 km/h (35 mph) 988 hPa (29.18 inHg) Myanmar, Bangladesh, West Bengal, Jharkhand, Odisha, Bihar, Chhattisgarh None 0
ARB 02 30 September – 1 October Depression 45 km/h (30 mph) 1002 hPa (29.59 inHg) Goa, Maharashtra, Karnataka None 0
Tej 20 October – 24 October Extremely severe cyclonic storm 175 km/h (110 mph) 959 hPa (28.32 inHg) Socotra, Yemen, Oman Unknown 2
Hamoon 21 October – 25 October Very severe cyclonic storm 120 km/h (75 mph) 985 hPa (29.09 inHg) Bangladesh Unknown 5
Midhili 14 November –Present Cyclonic Storm 75 km/h (45 mph) 1000 hPa (29.53 inHg) India None 0
Season aggregates
8 systems
(1 unofficial)		 30 January – Season ongoing 215 km/h (130 mph) 938 hPa (27.70 inHg)damage=$1.6 billion {{{damage}}} 487

See also

Notes

  1. ^ As the IMD did not recognise this system as a tropical cyclone, this wind estimate is from the JTWC and thus sustained over one minute (as opposed to three minutes for the other wind estimates in this table).
  2. ^ As the IMD did not recognise this system as a tropical cyclone, this pressure estimate is from the JTWC.

References

  1. ^ "Climatology of Tropical Cyclones over North Indian Ocean (NIO)" (PDF). severeweather.wmo.int. 8 December 2022. Archived (PDF) from the original on 6 March 2023. Retrieved 8 December 2022.
  2. ^ "Annual Frequency of Cyclonic Disturbances (Maximum Wind Speed of 17 Knots or More), Cyclones (34 Knots or More) and Severe Cyclones (48 Knots or More) Over the Bay of Bengal (BOB), Arabian Sea (AS) and Land Surface of India" (PDF). India Meteorological Department. Archived (PDF) from the original on 15 December 2017. Retrieved 30 October 2015.
  3. ^ a b Prognostic Reasoning for Tropical Cyclone 03B (Three) Warning No. 1 (Report). United States Joint Typhoon Warning Center. 9 June 2023. Archived from the original on 12 June 2023. Retrieved 12 June 2023.
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  34. ^ Special Tropical Weather Outlook for North Indian Ocean issued at 0500 UTC of 06.06.2023. based on 0000 UTC of 06.06.2023 (PDF) (Report). New Delhi, India: India Meteorological Department. 6 June 2023. Retrieved 11 June 2023.
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  36. ^ Special Tropical Weather Outlook for North Indian Ocean issued at 0930 UTC of 06.06.2023. based on 0600 UTC of 06.06.2023 (PDF) (Report). New Delhi, India: India Meteorological Department. 6 June 2023. Retrieved 11 June 2023.
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  39. ^ Prognostic Reasoning for Tropical Cyclone 02A (Biparjoy) Warning No. 4 (Report). United States Joint Typhoon Warning Center. 7 June 2023. Archived from the original on 12 June 2023. Retrieved 12 June 2023.
  40. ^ Prognostic Reasoning for Tropical Cyclone 02B (Biparjoy) Warning No. 6 (Report). United States Joint Typhoon Warning Center. 7 June 2023. Archived from the original on 12 June 2023. Retrieved 12 June 2023.
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